R-1830-94
The engines installed on the R4D-6 are
relatively rare for DC-3's, both civilian and military. The
typical engine was the R-1830-92 which had a takeoff horsepower rating of
1200 HP, 150 less than the -94.

LOWER COWLING
REMOVED With the lower cowl removed
for maintenance you can get a better view of the engine.

AIR SCOOPS
The extra length "desert scoops" have a larger
air filter installed that can be off. Most R4D's and C-47's that were
modified back to DC-3 status after the war for airline use had these
filtered scoops removed. This was done to save weight since the
civilian DC-3's were normally not operating in dusty conditions.

DC-3 SCOOP
CONFIGURATIONS Using screenshots of three
MAAM-SIM DC-3 models we can
compare all three P&W air scoop configurations. The top picture is the
R4D-6 with its "desert scoops". The second shows the regular
filtered scoops, and the third are un-filtered scoops.